On 11/07/2012 06:26 PM, David Solda wrote:
Dmitry, all,
To clarify my comment. Our protocol utilizes 8 bytes which are needed in our driver. In order for the Linux system to accept 8 bytes of data, the Linux psmouse system driver is required to be modified. Without this modification, the driver that you are referring to will not work correctly. The psmouse system driver change that would be required is the item that would be rejected.
I appreciate your comments and of course, if the driver could be upstreamed, it would (we already have I2C drivers updstreamed for Chrome systems), but there is a difference here.
I will again look into the possibility of what you are requesting, however, the changes are extremely low if not zero that it will be accepted.
Why? If drivers were kept out of the kernel because the hardware they
are designed to run requires strange things or was badly designed, there
would be a lot fewer drivers in the kernel than there are today.
Firmware and hardware frequently does bizarre or nonsensical things and
we just have to deal with it.
Dave
-----Original Message-----
From: Dmitry Torokhov [mailto:dmitry.torokhov@xxxxxxxxx]
Sent: Wednesday, November 07, 2012 4:16 PM
To: David Solda
Cc: Troy Abercrombia; Kamal Mostafa; Ozan Çağlayan; linux-kernel@xxxxxxxxxxxxxxx; linux-input@xxxxxxxxxxxxxxx; customercare; mario_limonciello@xxxxxxxx
Subject: Re: Why Cypress does not upstream its trackpad driver?
Hi David,
On Wednesday, November 07, 2012 06:30:11 PM David Solda wrote:
Kamal,
My name is Dave Solda and I would be happy to answer any other
questions that you have. Troy's response is correct however as in
order to support the default Linux mouse class, our firmware would
also have to be modified to do so, which cannot be done in system. Our
packet protocol maxes out at an 8 byte packet, which requires a change
to the Linux standard in this case.
I am unable to parse this... I do not believe anyone asks you to change your firmware and if your protocol needs 8 bytes to transmit device state - that's fine.
Our goal in working with canonical was to provide something on Linux
that would support multi-touch and not only have default single finger
movement supported.
If I am mistaken and he Linux kernel would accept this, then we can
proceed to upstream, however all indications we have is that this
patch would be rejected. If you (or others on from the locus alias)
have any inputs, I would be happy to receive them.
This really depends on whether the changes to the psmouse framework make sense or not. Please start submitting patches for review/discussion and we can go from there.
Thanks.
--
Dmitry
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